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Circulation unit

GRA100

The ESBE series GRA100 is a circulation mixing unit intended for heating circulations where an outstanding flow and temperature control are required. Equipped with two shut-off valves with thermometers, check valve, high class insulation shell and high efficiency circulation pump. The GRA100 is delivered with a 3-way rotary progressive mixing valve and actuator. The Circulation Mixing Unit ensures best regulation performances independent from flow rate and low oversizing risk thanks to progressive valve characteristic, as well as the working possibility with most controllers available on the market.

Outstanding flow control thanks to the progressive characteristic of the valve

The circulation pump should be preceded by a multi-pole contact breaker in the fixed installation.

Wiring, Actuator ARA661

The actuator should be preceded by a multi-pole contact breaker in the fixed installation.

Wiring, Actuator ARA639

Valve characteristics

Available pressure, Wilo pump

Dimensioning, Pump Capacity diagramExample: Start with the heating demand of heating circuit (e.g. 25 kW) and move horizontally to the right in the diagram to the Δt = 15°C (temperature difference between flow and return of the heating circuit). Next go up and find working point and read the available pressure of the pump on the left – ∆p = 45 kPa.